The Power with Zero Exponent. The Power with Negative Exponent

If `a!=0` , then `a^0=1` .

For example, `(2.7)^0=1; (-5)^0=1`.

The zero power of number ` `0 hasn′t meaning.

If `a!=0` and `n` - natural number, then `a^-n=1/a^n` .

For example, `5^-3=1/5^3=1/125; (-2)^-2=1/(-2)^2=1/4` .

It is correct the following equality: `(a/b)^-n=(b/a)^n`